Human sexuality has lost all meaning to me.

[MichaelD]

I am much the same with regards to being completely open in my sexuality. I am in a monogamous relationship currently because my partner isn't yet ready for multiple partners, and I have no desire in seeking another partner anyway. I think humans specifically seem adapted to have many relationships; however, it is clear that we have a bias towards one partner whom we share most of our time with. Whether this is a product of evolution or something else remains speculation.

I think you would enjoy reading some of David Deida. He has a couple books on the topic of human sexuality. One of the few who discuss it with a spiritual flavor. Something that has stuck with me is this: ask yourself if this relationship (any current or potential) serves the world. Is this just going to serve me, or will it serve all of creation? The answer to that question will likely give you some insight.

I think the whole free love thing is great, but it is used all too often as an excuse to just screw anyone and everyone for simple personal desires of freedom and pleasure. Do you seek a relationship to serve yourself, your partner, or all of creation? It seems to me that's really the question you need to answer. The hidden bonus for the third option is you're both part of creation